Trump arrived in Japan on Saturday for a largely ceremonial state visit meant to showcase strong ties between the two countries.
The Republican president is unhappy with Japan's large trade surplus and is considering putting high tariffs on its auto exports if a bilateral trade agreement is not reached.
Shinzo Abe posts a selfie with Donald Trump
Japanese Prime Minister Shinzo Abe posted a selfie with President Trump on Sunday as the two leaders played golf at a country club outside of Tokyo.
The Prime Minister's office also posted a video of Abe and Trump in a golf cart as they made their way around the exclusive Mobara Country Club course.
After lunch at the golf course, where Trump had a cheeseburger, the two were due to return to Tokyo to watch a sumo match in the afternoon.
'An incredible evening'
Trump spent what he said was 'an incredible evening' watching the Japanese national sport of sumo.
'I've always wanted to see sumo wrestling, so that was really great,' Trump said at the start of a dinner with Abe, accompanied by his wife, Melania, and Abe's wife Akie, just after the match. That was an incredible evening.'
About 1,000 of the 11,000 seats in the legendary Kokugikan sumo venue, including some of the most expensive, were reserved for Trump, Abe and their security teams.
United States President's Cup
Trump presented the 25-year-old Asanoyama with a custom-made trophy called the United States President's Cup.
He is also set to become the first foreign dignitary to meet the new Emperor and Empress.
Traditional Japanese dinner with Shinzo Abe
US President Donald Trump wrapped up a day of personal diplomacy shadowed by trade issues on Sunday with a traditional Japanese dinner with Prime Minister Shinzo Abe.
The two leaders and their wives enjoyed 'robatayaki', or grilled meat fish and vegetables served on wooden paddles.